Electronics - Operational Amplifiers - Discussion



Decreasing the gain in the given circuit could be achieved by

[A]. reducing the amplitude of the input voltage
[B]. increasing the value of the feedback resistor
[C]. increasing the value of the input resistor
[D]. removing the feedback resistor

Answer: Option C


No answer description available for this question.

Uuumkl said: (Mar 3, 2011)  
In inverting amp gain is-rf/ri if we decrease gain ri will increase.

Vatsala Sharma said: (May 23, 2011)  
Gain of inverting amplifier is inversely proportional to input resistance. So, gain decreases when input resistance is increase.

Manoj S Awakhare said: (Jun 30, 2012)  
Acctually the diagram is in inverting configuration. So it has gain equation Gain= -Rf/Rin. It means gain inversly proportional to Rin. Therefore answer is C.

Rashmi said: (Aug 12, 2012)  
Gain of an inverting amplifier= -Rf/Ri, therefore the answer is "C".

Dushyanth said: (Jan 11, 2015)  
Why can't removing the feedback resistor be an option. Since Gain = Rf/Ri.

And Rf = ohms if we remove the feedback resistor Rf = 0. So Rf is reduced so gain will also be reduced. But why is't that a correct option.

Shahid said: (Feb 12, 2015)  

Removing feedback resistor will make Rf = Infinity whereas shorting it will make feedback resistor Rf=0.

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